Fast and efficient CO 2 absorption in non-aqueous tertiary amines promoted by ethylene glycol

With the catalytic induction of EG, anhydrous DMEA shows CO 2 absorption performance via chemical binding and physical storage under normal pressure. Among the absorbents, pure DMEA can hardly absorb CO 2 directly but when the zwitterionic alkylcarbonates are formed between CO 2 and DMEA-EG which can be characterized by 13 C NMR and FTIR, the absorption rate of CO 2 will be improved at this time. An increasing the CO 2 loading as the mass fraction of EG in DMEA-EG, 90wt.% EG captures up to 0.72 mol/mol. The amount of chemically bound and physically stored is directly dependent on temperature, within the range of 293 to 323K, an absorption-regeneration cycle can be formed in a closed vessel because of the zwitterion DMEA-EG-CO 2 is unstable at the higher temperature. In other words, DMEA-EG-CO 2 can be easily regenerated upon appropriate depressurization or heating, corresponding thermodynamic calculations prove that the regenerative energy of DMEA-EG-CO 2 is 25.49kJ/mol.